week15攝影角度 shen

 跟之前一樣下載windows和data，把兩個解壓縮，把data拉進windows

再來下載git

載上禮拜檔案

然後建立一個project專案

新增程式碼

float eyeX = 0, eyeY = 0;

void motion(int x, int y){

    eyeX = 3*(x-320)/320.0;

    eyeY = 3*(240-y)/240.0;

    glLoadIdentity();

    gluLookAt(eyeX, eyeY, 3, 0, 0, -6, 0, 1, 0);

    glutPostRedisplay();

}

glutMotionFunc(motion);

可以看到模型視角改變~~

新增程式碼    

glOrtho(-ar*3, ar*3, -1.0*3, 1.0*3, 2.0, 100.0);

註解掉glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

就會對稱

接著調整以下3項數值

glOrtho( )

glFrustum( )

gluPerspective( )

都會有不一樣的視角效果來觀看模型

很特別但是有點難理解

老師用手比劃給我們看有比姣好懂一點

新增程式碼

#include <GL/glut.h>

void display()

{

    glClear(  GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x, int y){

    glLoadIdentity();

    float eyeX = (x-150)/150.0, eyeY = (150-y)/150.0;

    gluLookAt(eyeX,eyeY,1, 0,0,0, 0,1,0);

    glutPostRedisplay();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week15");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

這樣就可以用不同角度來看茶壺瞜~~~

然後修改程式碼

#include <GL/glut.h>

void display()

{

    glClear(  GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x, int y){

    glLoadIdentity();

    float eyeX= (x-150)/150-0, eyeY= (150-y)/150.0;

    gluLookAt(eyeX ,eyeY ,1 , 0,0,0,   0,1,0);

    glutPostRedisplay();

    }

void reshape(int w, int h) {

    float ar =w / (float) h;

    glViewport(0, 0, w, h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(60,ar ,0.01,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(0,0,1,   0,0,0,    0,1,0);

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week15");

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

會有其他不同的觀看角度!!